Hanai Shiori, who works in the sales department of a fashion distribution website, is suddenly dumped by her boyfriend Keiichi on their third anniversary. While she is in tears at a bar, a kind man approaches and gently speaks to her. Leaning on his kindness, Shiori ends up spending the night with him. As time passes, Shiori discovers that she is pregnant. To make matters more complicated, the new company president who appears at her workplace turns out to be the very man from that night.

11 high school girls awaken bound to the floor of a dining room and must discover why they are there and how they can escape.